The first of the Northern forces to arrive on the scene of battle was the XVIII Corps of the Army of the James. Early in the morning of June 15 these troops, commanded by Gen. William F. Smith, crossed from Bermuda Hundred to the south side of the Appomattox by means of a pontoon bridge at Broadway Landing. Eighteen thousand Union soldiers were on their way to face less than 4,000 under Beauregard. Throughout the day they approached the city and assembled for the attack. The Union offensive opened shortly after 7 p. m. on June 15. Among the first places to fall was Battery 5, one of the strongest of the Confederate positions. Entering the ravine between Batteries 7 and 8, Smith’s men were able to approach Battery 5 and take it from the rear, the direction from which an attack was least expected. Within a few hours Beauregard had lost not only Battery 5 but all the line for more than a mile south. The defenders withdrew and threw up a hasty entrenchment along Harrison’s Creek, well to the rear of the captured section of the line. While this Confederate retreat was taking place, the Union II Corps, commanded by Gen. Winfield S. Hancock, arrived to reinforce the attacking columns. The appearance on the field of the II Corps was an ominous sign for the Confederacy. While the initial attacks were taking place on June 15, the Army of the Potomac had been busily engaged in crossing the James River farther to the east, on pontoon bridges. The number of Union troops south of the river was increasing hourly until by midnight of June 16 the entire army, numbering at least 90,000, had crossed. Darkness ended the fighting on June 15, but early the next day the attacks were renewed. More of the defense line south of the portion captured the previous day now gave way. In response to repeated entreaties from Beauregard throughout June 15 and 16, Lee ordered more divisions to the support of Petersburg. This necessitated the draining of precious reserves from the Richmond lines. By dusk of that second day Beauregard could muster about 14,000 to face the enemy. Thus, the center of attention rapidly shifted from Richmond to Petersburg, which had so recently seemed of but secondary importance. [Illustration: _Broadway Landing on the Appomattox River where the XVIII Corps of the Army of the James crossed on June 15, 1864. It was later used as an ordnance depot by the Union Army._ Courtesy, National Archives.] [Illustration: _Pontoon bridge at Broadway Landing constructed by the Union Army in 1864._ Courtesy, National Archives.]